Resettable locking shield-activated auto injector training device

1. A resettable injection training device, comprising: an outer shell comprising a proximal end and a distal end, the outer shell defining a chamber there within; a plunger slidable within the chamber, the plunger comprising a plunger feature and one or more rail portions; a locking safety shield disposed and slidable within the chamber, the safety shield comprising a proximal end and a distal end, the distal end for interfacing with a target surface to actuate the injection training device, said safety shield comprising an extended locked position, an extended unlocked position, and a retracted position; a rotatable plunger collar comprising a plunger collar tab for interfacing with the plunger feature and with the safety shield, wherein said plunger collar is rotated in a first direction to release the plunger from a pre-fired position to a fired position; a rotatable safety shield collar comprising a locking tab, the locking tab for interfacing with the safety shield to lock the safety shield in an extended, locked position in the fired position; a reset component disposed within the chamber, said reset component configured to interface with the safety shield collar to unlock the safety shield during reset of the device.

2. The resettable injection training device of claim 1 further comprising a reset cap for interacting with the plunger to reset the resettable injection training device.

3. The resettable injection training device of claim 2 , wherein the reset cap comprises a shaft portion for interfacing with the plunger during reset.

4. The resettable injection training device of claim 2 , wherein association of the reset cap with the distal end of the safety shield and with the plunger, and movement of the reset cap toward the proximal end of the safety shield resets the device.

5. The resettable injection training device of claim 4 , wherein the rotatable safety shield collar comprises one or more tabs and one or more notches disposed between the one or more tabs on its inner surface, such that movement of the plunger toward the proximal end of the outer housing causes the one or more rail portions to interact with the one or more tabs and slide the safety shield collar toward the proximal end of the outer shell.

6. The resettable injection training device of claim 5 , wherein the rotatable safety shield collar comprises a safety shield angled surface on its inner surface, and wherein the reset component comprises a complimentary angled surface, such that movement of the safety shield collar toward the proximal end of the outer shell causes the safety shield angled surface to interface with the reset component angled surface to rotate the safety shield collar to release the locking tab from the safety shield and unlock the safety shield.

7. The resettable injection training device of claim 6 , wherein rotation of the safety shield collar causes each rail portion of the plunger to align with a corresponding notch on the safety shield collar, such that the plunger can be further moved toward the proximal end of the outer shell to reset the device.

8. The resettable injection training device of claim 7 , wherein the plunger comprises a proximal end and a distal end, and the plunger feature comprises at least one plunger angled ramp portion at the proximal end.

9. The resettable injection training device of claim 8 , wherein the plunger collar tab comprising a plunger collar angled ramp portion for interfacing with the plunger angled ramp portion, when the plunger is moved toward the proximal end of the outer shell to reset the device.

10. The resettable injection training device of claim 9 , wherein a plunger collar torsion spring is associated with the plunger collar, such that the plunger collar is biased in a first direction, and movement of the plunger toward the proximal end of the outer shell causes the plunger collar to interface with the plunger angled ramp portion to rotate the plunger collar in a second direction, until the plunger feature traverses the plunger collar and the plunger is reset to a pre-fired position.

11. The resettable injection training device of claim 10 , wherein when the plunger collar torsion spring biases the plunger collar in the first direction, the plunger collar tab interfaces with the plunger feature to lock the plunger in the pre-fired position.

12. The resettable injection training device of claim 1 , wherein the safety shield can be moved from the unlocked extended position to the retracted position to fire the device.

13. The resettable injection training device of claim 12 , wherein the safety shield comprises a safety shield interfacing surface at its proximal end and the rotatable plunger collar comprises a plunger collar interfacing surface on an outer surface thereof, such that exertion of a force on the distal end of the safety shield to move it from the unlocked extended position to the retracted position causes the safety shield interfacing surface to interface with the plunger collar interfacing surface to rotate the plunger collar in a second direction.

14. The resettable injection training device of claim 13 , wherein rotation of the plunger collar in the second direction releases the plunger collar tab from the plunger feature, such that the plunger extends from a pre-fired position to a fired position.